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Clinical and Diagnostic Laboratory Immunology, 01 1996, 89-92, Vol 3, No. 1
Copyright © 1996 by the American Society for Microbiology. All rights reserved.

Production of agglutinating monoclonal antibody against antigen 8 specific for Cryptococcus neoformans serotype D

R Ikeda, S Nishimura, A Nishikawa and T Shinoda
Department of Microbiology, Meiji College of Pharmacy, Tokyo, Japan.

A hybridoma (clone CRND-8) that produced agglutinating monoclonal antibody (MAb) against Cryptococcus neoformans serotype D was established by using a soluble capsular polysaccharide-keyhole limpet hemocyanin conjugate for immunization. The isotype was immunoglobulin M(kappa). Specificity was determined by cell slide agglutination and enzyme-linked immunosorbent assay (ELISA). In both tests, the MAb reacted to serotypes D and A-D but not to serotypes A, B, and C. Furthermore, the specificity of the MAb determined by ELISA was the same as that of polyclonal antibody factor serum (PAb factor) 8, which showed high-level reactivity with serotypes D and A-D. These results supported the deduced specificity of the PAb-based antigenic factor 8. A total of 15 isolates of serotypes D and A-D but no serotype A isolates reacted with the MAb in cell slide agglutination tests. CRND-8 MAb can be used in place of PAb factor 8 for serotyping C. neoformans isolates and for the analysis of the antigen 8 epitope.

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